Помогите! 40 баллов!
1. Cos²x=1/2
2. [tex]\frac{log^{2} _{2}10+log_{2}10*log_{2} 5-2 log^{2}_{2} 5 }{log_{2} 10+2log_{2} 5}[/tex]
3. [tex]\frac{7}{9^{x}-2 } \geq \frac{2}{3^{x} -1}[/tex]
1. Cos²x=1/2
2. [tex]\frac{log^{2} _{2}10+log_{2}10*log_{2} 5-2 log^{2}_{2} 5 }{log_{2} 10+2log_{2} 5}[/tex]
3. [tex]\frac{7}{9^{x}-2 } \geq \frac{2}{3^{x} -1}[/tex]
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